If people were not crossing the border illegally the militia would have no one to detain.
Are these militia boys hired as private security for the private citizen who owns the land they're trespassing on?
That is one scenario where they would actually have some authority, same as any other armed security guards.
If the land is state or federal land, and they're not sworn law enforcement or sworn military, they have ZERO authority, unless they have been duly deputized by law enforcement or sworn by official state militia. Outside of that, there are reasons why ordinary people aren't supposed to dress up as fake military and attempt to do what the military does, or fake law enforcement and attempt to do what law enforcement does.
As was mentioned earlier, it opens the door to abuse, because fake military and fake cops are not accountable to anybody.
In a free country, things like accountabilty and authority are supposed to actually mean something.
If you're going to support this nonsense, then you just gave me the all the authority I need to go rounding up people like you in the middle of the night, or pulling you over on the road. See, I can go buy camo and guns and tactical vests, too...and I can self appoint and grant myself all the authority I need, too.
I can even say that GOD HIMSELF GAVE me the authority to arrest right wingers.
Thanks! Where do you live? If you live out East, maybe I can send "Officer" George Zimmerman instead.
He thought HE was a cop, too.